/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.appspot.eusms.mms;

import android.content.Context;
import android.net.Uri;
import android.util.Log;

import com.appspot.eusms.util.LRUCache;

import org.whispersystems.textsecure.crypto.MasterSecret;

import java.io.UnsupportedEncodingException;
import java.lang.ref.SoftReference;
import java.util.Collections;
import java.util.Map;

import ws.com.google.android.mms.ContentType;
import ws.com.google.android.mms.pdu.CharacterSets;
import ws.com.google.android.mms.pdu.PduPart;

public class TextSlide extends Slide {

    private static final int MAX_CACHE_SIZE = 10;
    private static final Map<Uri, SoftReference<String>> textCache =
            Collections.synchronizedMap(new LRUCache<Uri, SoftReference<String>>(MAX_CACHE_SIZE));

    public TextSlide(Context context, MasterSecret masterSecret, PduPart part) {
        super(context, masterSecret, part);
    }

    public TextSlide(Context context, String message) {
        super(context, getPartForMessage(message));
    }

    @Override
    public boolean hasText() {
        return true;
    }

    @Override
    public String getText() {
        try {
            SoftReference<String> reference = textCache.get(part.getDataUri());

            if (reference != null) {
                String cachedText = reference.get();

                if (cachedText != null) {
                    return cachedText;
                }
            }


            String text = new String(getPartData(), CharacterSets.getMimeName(part.getCharset()));
            textCache.put(part.getDataUri(), new SoftReference<String>(text));

            return text;
        } catch (UnsupportedEncodingException uee) {
            Log.w("TextSlide", uee);
            return new String(getPartData());
        }
    }

    private static PduPart getPartForMessage(String message) {
        PduPart part = new PduPart();

        try {
            part.setData(message.getBytes(CharacterSets.MIMENAME_UTF_8));

            if (part.getData().length == 0)
                throw new AssertionError("Part data should not be zero!");

        } catch (UnsupportedEncodingException e) {
            Log.w("TextSlide", "ISO_8859_1 must be supported!", e);
            part.setData("Unsupported character set!".getBytes());
        }

        part.setCharset(CharacterSets.UTF_8);
        part.setContentType(ContentType.TEXT_PLAIN.getBytes());
        part.setContentId((System.currentTimeMillis() + "").getBytes());
        part.setName(("Text" + System.currentTimeMillis()).getBytes());

        return part;
    }
}
